148 Mr. G. C. Champion's Revision of the 



16. Chauliognathus aterrimus. 



Chaidiognathus aterrimus, Gorh., Biol. Centr.-Am., Coleopt. 

 iii, 2, p. 76 (c^). 



Var. a. Prothorax rufous or flavous, rarely with various coalescent 

 marks on the disc, or two sinuous vittae and an oblong mark between 

 them, or three small transversely placed spots, black. 



Chauliognathus sp. ? (no. 25a), Gorh., loc. cit. p. 282 ($). 



(J. Aedeagus : median lobe obliquely bent, produced into a rather 

 long, broad, somewhat curved, spoon-shaped process at the apex; 

 left lateral lobe moderately stout, concave, broad at the base, 

 abruptly bowed before the middle, and Avith the longer apical 

 portion curved and feebly hooked at the tip; right lateral lobe 

 much shorter than the left, rather broad, compressed, pointed at 

 the tip. Plate VI, figs. 20, 20a. 



Hah. Mexico (Truqui), Puebla {Salle : types), Cuerna- 

 vaca in Morelos, Matamoros Izucar in Puebla {Hoge), Venta 

 de Zopilote in Guerrero {H. H. Smith). 



The two insects seen by Gorham were both from Puebla, 

 but he does not seem to have suspected their affinity, as 

 the female with a red prothorax was compared by him 

 with C. collaris, a very different insect. Amongst the 

 series of twenty-five examples now available for exam- 

 ination, most of which are from Cuernavaca, five only 

 have the prothorax black, and in one of these there are 

 two small transverse red marks on the anterior part of 

 the disc. This species has the entire upper surface opaque ; 

 the head rather small, the eyes somewhat prominent ; the 

 antennae long and slender in the male, shorter in the 

 female ; the prothorax subquadrate, with rather prominent 

 hind angles and broadly refiexed margins; the body (the 

 flavescent lateral margins of the abdomen excepted), 

 antennae, and legs black, the prothorax often wholly, or 

 in part, rufous. A male of each form has been dissected. 

 The single example ($) from Guerrero is larger and more 

 elongate than the rest. In one of the two males in the 

 Oxford Museum the prothorax is red, with various coales- 

 cent black markings on the disc, such as in C. hieroglyphicus. 



17. Chauliognathus exiguus. (Plate III, fig. 8, (^.) 



Chauliognathus exiguus, Gorh., Biol. Centr.-Am., Coleopt. 

 iii, 2, p. 283. 



